How to convert a MP3 to a AC3 file?

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File extension	.mp3
Category	Audio File
Description	MP3 is a digital music format which allows CD tracks to be reduced to around a tenth of their normal size without a significant loss of quality. MP3 gets rid of a lot of the information recorded in a song that our ears are not able to hear and then uses complex algorithms to reduce the file size. This then enables you to get hundreds of songs on to a CD and it also has opened up a new market over the internet - the download market as download times have been significantly reduced.
Actions	MP3 Converter View other audio file formats
Technical Details	The MP3 format is a lossy format. That means that an MP3 file does not contain 100% of the original audio information. Instead, MP3 files use perceptual coding. In other words, that means it removes the information that your ear doesn't notice thereby making the file smaller. The reason lossy formats are used over RAW is that RAW audio files are too large to travel over the internet at any great speed. By using lossy formats it enables even dial up users to download mp3 files at a reasonable speed. RAW file formats generally require 176,000 bytes per second compared to a lossy format which requires 17,600. The difference is massive and so are the download times.
Associated programs	RealOne WinAmp iTunes Windows Media Player
Developed by	Moving Picture Experts Group
MIME type	audio/mpeg
Useful links	Further information on MP3 files How MP3 files work

File extension	.ac3
Category	Audio File
Description	AC3 is an audio file specifically developed by Dolby Digital to provide surround sound audio. The format is used for audio on many DVD and Blu-Ray media. In order for the file to be correctly decoded and output, a DVD player with a Dolby Digital compatible home cinema system is required. It became the de facto standard for surround sound, and has held that position since its inception in 1992, with it coming to home cinema in 1995.
Actions	AC3 Converter View other audio file formats
Technical Details	AC3 allows for separate audio to be defined for each of the 6 speakers in the standard cinema and home cinema setup. This produces the effect of surround sound to the person listening to the audio file. The six channels consist of right front, center, left front, rear right, rear left and a sub woofer.
Associated programs	QuickTime Player VLC Media Player Windows Media Player
Developed by	Dolby Digital
MIME type	audio/ac3 audio/vnd.dolby.dd-raw audio/x-ac3
Useful links	Information on AC3 Offiial Dolby Digital Website

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